The mysql-test-run-shell.sh script was improperly evaluating an expression for setting up multiple masters.

This fix adds the `expr $MASTER_MYPORT + 1` construct to the offending line in order for the expression to evaluate properly and produce 9307 instead of the string "9306+1"  

MYSQL_VERSION_ID is tested before it has been defined.  This leads to
a warning when compiling with -Wundef and it also will break the
internal logic of mysql_com.h as soon as MYSQL_VERSION_ID exceeds
50000.

The fix entailed a simple re-ordering of included files in mysql.h


include/mysql.h:
  Fix for Bug #20246 (enum mysql_enum_shutdown_level not well-defined in mysql_com.h)
  
  MYSQL_VERSION_ID is tested before it has been defined.  This leads to
  a warning when compiling with -Wundef and it also will break the
  internal logic of mysql_com.h as soon as MYSQL_VERSION_ID exceeds
  50000.
  
  Placed the #include for mysql_version.h above mysql_com.h to resolve conflict

into  neptunus.(none):/home/msvensson/mysql/mysql-4.1-maint


mysql-test/mysql-test-run.pl:
  Auto merged

mysql-test/mysql-test-run.pl:
  delete $default_vardir if the 4.1 vardir trick is to be used to re-enable more than one test run in sequence

into  neptunus.(none):/home/msvensson/mysql/mysql-4.1-maint


Makefile.am:
  Auto merged
client/mysqltest.c:
  Auto merged
mysql-test/lib/mtr_process.pl:
  Auto merged
mysql-test/mysql-test-run.pl:
  Auto merged
sql/mysqld.cc:
  Auto merged

into  neptunus.(none):/home/msvensson/mysql/mysql-4.1-maint

 - Add CR_CONN_HOST_ERROR to list of errorcode that trigger another connection
   attempt in mysqltest


client/mysqltest.c:
  Add CR_CONN_HOST_ERROR to errorcodes that trigger a reconnect

into  example.com:/work/bug24395-v2/my41


myisam/mi_open.c:
  Auto merged

into  kahlann.erinye.com:/home/df/mysql/build/mysql-4.1-build

mysql-test/lib/mtr_process.pl:
  print extra message _once_ every 60 seconds

into  dl145s.mysql.com:/data0/bk/team_tree_merge/MERGE/mysql-4.1-opt

into  neptunus.(none):/home/msvensson/mysql/mysql-4.1-maint


mysql-test/mysql-test-run.pl:
  Auto merged

into  bodhi.local:/opt/local/work/mysql-4.1-runtime

into  neptunus.(none):/home/msvensson/mysql/mysql-4.1-maint


mysql-test/mysql-test-run.pl:
  Auto merged

  Remove soft links before creating source TAR, to avoid file copies (bug#11865)


Makefile.am:
  Remove soft links before creating source TAR, to avoid file copies (bug#11865)

into  dl145s.mysql.com:/data0/bk/team_tree_merge/MERGE2/mysql-4.1-opt

into  dl145s.mysql.com:/data0/bk/team_tree_merge/MERGE2/mysql-4.1-opt

into  kahlann.erinye.com:/home/df/mysql/build/mysql-4.1-build-work

mysql-test/mysql-test-run.pl:
  remove dependency on Data::Dumper, it's not used anywhere

the problem is that client tools are compiled with UNDEF_THREADS_HACK
flag, and my thread-related additions to the mysqltest.c can't be compiled.
Easy solution is to disable these in not-embedded case completely.


client/mysqltest.c:
  it's used in embedded server only

into  bodhi.local:/opt/local/work/mysql-4.1-runtime


libmysql/libmysql.c:
  Auto merged
libmysqld/lib_sql.cc:
  Auto merged
sql/item_sum.cc:
  Auto merged

where we know how to creat the vardir 
Remove unused variable

into  neptunus.(none):/home/msvensson/mysql/mysql-4.1-maint


mysql-test/mysql-test-run.pl:
  Auto merged

 - Avoid use of mtr_run when executing "mysqld --verbose --help" to find
   version and supported features


mysql-test/mysql-test-run.pl:
  Don't use mtr_run when executing "mysqld --verbose --help" to find
  version and supported features.

into  neptunus.(none):/home/msvensson/mysql/mysql-4.1-maint


client/mysqltest.c:
  Auto merged
Makefile.am:
  Manual merge
mysql-test/mysql-test-run.pl:
  Manual merge

into  neptunus.(none):/home/msvensson/mysql/mysql-4.1-maint


mysql-test/mysql-test-run.pl:
  Auto merged

into  neptunus.(none):/home/msvensson/mysql/mysql-4.1-maint


mysql-test/mysql-test-run.pl:
  Auto merged

in all cuurently known log files 

After that it will by default use log tables. That setting can be overruled
by adding a -master.opt file like mysql_client_test has.

ALTER TABLE DISABLE KEYS doesn't work when modifying the table
  
ENABLE|DISABLE KEYS combined with another ALTER TABLE option, different
than RENAME TO did nothing. Also, if the table had disabled keys
and was ALTER-ed then the end table was with enabled keys.
  
Fixed by checking whether the table had disabled keys and enabling them
in the copied table.


myisam/mi_open.c:
  Extend mi_indexes_are_disabled to implement return value
  2 - Non-unique indexes are disabled
mysql-test/r/alter_table.result:
  update result
mysql-test/t/alter_table.test:
  update test
sql/sql_table.cc:
  When ENABLE|DISABLE index is combined with another option
  different than RENAME TO, we should ENABLE|DISABLE the keys of
  the modified table. Also when modifying we should preserve the
  previous state of the indices.
  (This problem exists in 5.0 and 5.1 but since the codebase has
  diverged, this fix won't automerge, but the fix will be quite
  similar).

  If using \$(srcdir)/mysql.info in action, use same in rule.


Docs/Makefile.am:
  If using \$(srcdir)/mysql.info in action, use same in rule.

into  neptunus.(none):/home/msvensson/mysql/mysql-4.1-maint


mysql-test/mysql-test-run.pl:
  Auto merged

into  neptunus.(none):/home/msvensson/mysql/mysql-4.1-maint


mysql-test/mysql-test-run.pl:
  Auto merged